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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2020, Vol. 14 Issue (5) : 1039-1048     https://doi.org/10.1007/s11709-020-0667-7
FOREFRONT PERSPECTIVE
Mechanism and control of the long-term performance evolution of structures
Zhiqiang DONG1,2, Gang WU1,2(), Hong ZHU1,2, Haitao WANG3, Yihua ZENG1,2
1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
2. National and Local Joint Engineering Research Center for Intelligent Construction and Maintenance, Nanjing 210096, China
3. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
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Abstract

It is well known that structural properties degrade under long-term environmental exposure and loading and that the degradation rate is controlled by inherent physical and chemical degradation mechanisms. The elucidation of the degradation mechanisms and the realization of effective long-term performance degradation control have been a research frontier in the field of civil engineering in recent years. Currently, the major topics that concern this research frontier include revealing the physical and chemical mechanisms of structural performance evolution under long-term environmental exposure and loading and developing structural performance degradation control technologies based on fiber-reinforced materials, for example, fiber-reinforced polymers (FRPs) and fabric-reinforced cementitious matrix (FRCM). In addition, there are novel structural performance control technologies, such as using a shape memory alloy (SMA) and self-healing concrete. This paper presents a brief state-of-the-art review of this topic, and it is expected to provide a reference for subsequent research.

Keywords degradation mechanism      performance evaluation strengthening      FRP      FRCM     
Corresponding Author(s): Gang WU   
Just Accepted Date: 31 August 2020   Online First Date: 28 September 2020    Issue Date: 16 November 2020
 Cite this article:   
Zhiqiang DONG,Gang WU,Hong ZHU, et al. Mechanism and control of the long-term performance evolution of structures[J]. Front. Struct. Civ. Eng., 2020, 14(5): 1039-1048.
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http://journal.hep.com.cn/fsce/EN/10.1007/s11709-020-0667-7
http://journal.hep.com.cn/fsce/EN/Y2020/V14/I5/1039
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Zhiqiang DONG
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Fig.1  Flowchart of the overall research method for long-term performance control.
Fig.2  Schematic diagrams of the effect of the maintenance on structural performance.
Fig.3  FRP materials and mechanical properties. (a) FRP composition and mechanical properties; (b) typical FRP products.
Fig.4  Typical EB-FRP strengthening system.
Fig.5  Typical NSM-FRP strengthening systems. (a) Schematic diagram; (b) flexural; (c) shear strengthening.
Fig.6  Typical systems of strengthening with externally prestressed FRP tendons. (a) Anchorage system; (b) deviator; (c) externally flexural strengthening.
Fig.7  FRCM materials and their mechanical properties. (a) FRCM; (b) stress-strain response.
Fig.8  Research on the strengthening of concrete structures with FRCM. (a) Bond behavior; (b) flexural strengthening; (c) shear strengthening; (d) column confinement. (reproduced from Ref. [57])
Fig.9  Research on the strengthening of masonry structures with FRCM. (a) In-plane strengthening; (b) out-of-plane strengthening; (c) strengthening of arches.
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